Coated metal pipe.



No. 657,605. Patented sepan, |900.

w. LACY.

COATED METAL PIPE.

(Application led Jan. 15, 1900.) (No Model.)

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UNITED STATES PATENT OFFICE.

WILLIAM LAoY,.oF LosiANGELEs, CALIFORNIA.

,COATED METAL PIPE.

EECTON formingpart of Letters Patent N o. 657,605, dtd Septem 11 17900-Application filed January 15, 1900. erial No. .-575. (No model.) u l Toall whom it may concern:

Beit known that l, WILLIAM LACY, a citizen of the United States,residing at Los An-` geles, in the county of LosAngeles and State ofCalifornia, have invented a new and useful Improvement in Coated MetalPipes, of which the following is a specification.

My invention relates more particularly to undergrounglwpipes and is animprovement over the invention set forthin Letters Patent granted tomeby the United States May 24, 1892, No. 475,454, for coated met-al pipeand methods of manufacturing the same.

My present invention is superior to that patented to me, as aforesaid,in that I use a fibrous sheet coated with a preservative gum andrendered absolutelyimpervious to mois-` ture and provide a coating ofpractically indestructible material embedded in the coating ofpreservative gum exterior the sheet of fibrous material. I prefer smallgravel or' broken quart-z for the exterior coating, but any suitablesilicious material will serve. The use of a fibrous sheet allows of amore tenacious covering, and the use of a silicious covering preventsany injury to the fibrous coat and prevents any wearing of the pipe fromany ordinary handling or usage in transit to the point where the pipe isto be laid. A further advantage is that the silicious outer coveringpresents a surface which is clean, and the pipe can therefore be handledwithout inconvenience and will not adhere to other surfaces,as a surfacecovered with a gumV is liable to do when exposed to the heat of the sun.A further advantage of providing the exterior coating of siliciousmaterial is that it is not subject to decay and is not liable to beattacked by alkali soils.

The object of this invention is to provide a pipe havingvsuperior powersof resistance to the destructive forces to which underground pipe issubjected after being laid, and also to preventinj ury to coating ofasphaltum on the pipe while in transit from place where made to placewhere laid.

My present invention consists in constructing a pipe with a strong innershell of metal or other suitable material and an outer coating of grainsof hard inelastic material and an intermediate cushioning-body.

My newly-invented pipe comprises a metal hard inelastic material, and asuitable bindi ing material. Preferably the metal shell has a coatinginside and out of asphaltum or other suitable gum, and a fibrous sheetis applied outside the coated pipe with a coating of asphaltum or othersuitable gum, and outside of the coated sheet is a coating of finegravel embedded in and held by the coating of gum on the sheet.

The accompanying drawings illustrate my invention.

Figure 1 is a perspective view of a section of pipe embodying myinvention. Fig. 2 is a fragmental enlarged cross-section of the pipe.

1 indicates the metal pipe.

2 and 'respectively Vindicate coatings of preservative gum on theinterior and exterior ofthe metal pipe. r

4 and 6 indicate layers of fibrous sheets.

5 indicates the coating of preservative gum between the fibrous sheets.

' 7 indicates the coating of preservative gu m on the outer side of thesheet 6.

8 indicates the coating of silicious material embedded in the coating 7of preservative gum. The fibrous material and the gum form an elastic orcushioning body between the harder outer coating and the metal shell.

In the manufacture of my improved pipe the inner shell of the pipe isdipped in heated asphaltum or other preservative gum or gums, and thefibrous sheets with asphaltum between are applied to its outside, theouter side of the fibrous sheet havinga coat of asphalt or preservativegum applied thereto and a coating of silicious material is embedded inthe gum, either by means of rollers or by pressure applied inany-suitable manner.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

l. A pipe comprising a strong inner shell; an outer coating of grains ofhard inelastic material; and an intermediate cushioningbody.

2. A pipe comprising a metal shell; an intermediate cushioning-body; andacoating of ne gravel outside the cushioning-body.

3. A pipe comprising a metal shell; a body strong shell, preferablya IOOeoatiugon the shell; a fibrous sheetoutsidei` `formed'oa iibrousfsheetand a gum; 'aud *a coating of VAiiue gravel outside fth'e brois sheet. l

4. A pipe, comprising a metal shell; .a

lb'rous. coating outside the metal shell; anW

exterior coating vof granular hardjnelastio material and a suitablebinding materiali` 5. A pipe comprising a metal shell; a gum the gumcoating gV a gum coating outside-the fibrous sheet; and a coating ofgranulated hard and inelastic material v outside thefgum coating ofs'aid'siheet.

6. The oombination of `a-rnetal pipeihaving

